JPS5761319A - Electronic variable resistor - Google Patents

Electronic variable resistor

Info

Publication number
JPS5761319A
JPS5761319A JP13629380A JP13629380A JPS5761319A JP S5761319 A JPS5761319 A JP S5761319A JP 13629380 A JP13629380 A JP 13629380A JP 13629380 A JP13629380 A JP 13629380A JP S5761319 A JPS5761319 A JP S5761319A
Authority
JP
Japan
Prior art keywords
resistance
resistance value
fet4
terminal
series
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP13629380A
Other languages
Japanese (ja)
Inventor
Shinzo Koo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP13629380A priority Critical patent/JPS5761319A/en
Publication of JPS5761319A publication Critical patent/JPS5761319A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/46—One-port networks

Landscapes

  • Networks Using Active Elements (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To improve the stability and life of a resistor while widening the setting range of a resistance value by measuring the resistance value of a variable resistance element by connecting a fixed resistor in series to the element, and by exercising negatie feedback control over the element by a negative feedback circuit. CONSTITUTION:For the measurement of the source-drain resistance Rx of an FET4, a resistance R1 whose resistance value is known is inserted in series. Then, a current is flowed to a terminal 1 and the source-drain voltage of the FET4 and the terminal voltage of the resistance R1 are applied to differential input amplifiers 12 and 13, whose outputs are inputted to a divider 14. Consequently, the ratio of the resistance Rx to fixed resistance R1 is detected and a voltage corresponding to a desired resistance value is applied from a terminal 4 to make a comparison between the both; and negative feedback is provided to the FET4 according to the comparison result to obtain the desired resistance value.
JP13629380A 1980-09-30 1980-09-30 Electronic variable resistor Pending JPS5761319A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13629380A JPS5761319A (en) 1980-09-30 1980-09-30 Electronic variable resistor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13629380A JPS5761319A (en) 1980-09-30 1980-09-30 Electronic variable resistor

Publications (1)

Publication Number Publication Date
JPS5761319A true JPS5761319A (en) 1982-04-13

Family

ID=15171781

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13629380A Pending JPS5761319A (en) 1980-09-30 1980-09-30 Electronic variable resistor

Country Status (1)

Country Link
JP (1) JPS5761319A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59189328U (en) * 1983-06-01 1984-12-15 カルソニックカンセイ株式会社 variable resistance circuit
JPH05199070A (en) * 1991-03-14 1993-08-06 Bull Sa Integrated circuit having variable impedance and information processing system using said integrated circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5173863A (en) * 1974-12-23 1976-06-26 Nippon Electric Co RENDOKAHENTEIKO SOCHI
JPS51114050A (en) * 1975-03-31 1976-10-07 Yokogawa Hokushin Electric Corp Variable resistance circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5173863A (en) * 1974-12-23 1976-06-26 Nippon Electric Co RENDOKAHENTEIKO SOCHI
JPS51114050A (en) * 1975-03-31 1976-10-07 Yokogawa Hokushin Electric Corp Variable resistance circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59189328U (en) * 1983-06-01 1984-12-15 カルソニックカンセイ株式会社 variable resistance circuit
JPH05199070A (en) * 1991-03-14 1993-08-06 Bull Sa Integrated circuit having variable impedance and information processing system using said integrated circuit
US5398261A (en) * 1991-03-14 1995-03-14 Bull S.A. Integrated circuit having controller impedances and application to transceivers, in particular for communication between units of a system

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